Temperature on LCD doesn't update

please disregard the bitmap functions i didn't include any of that code cause its extremely long. i'm attempting to make a data acquisition system for my sae baja team, i'm wanting to have the temperature update at a normal interval but it doesn't, it will display the temperature the sensor reads on startup but will not update after that. sorry if this is a easy issue i'm new to arduino and not super experienced in coding to begin with.